As Dawzzy said it's 50%PG/50%VG.
I would suggest getting these options.
Liquid Base: (2). VG base.
Nicotine Density: (07). 48mg
Flavour: 191. Flavourless
Then leave the flavour strength as light, otherwise you're just paying more for flavourless.
48mg would allow you to mix at 1/3 for 16mg, 1/4 for 12mg and 1/2 for 24mg.
I would imagine you would be happy at 1/3 (16mg) which would give you a perfect PG/VG ratio in your juice. Just buy some PG and use 100% PG doublers. You could do the 1/4 nic no problem if you found 16 too strong which would give you a nice mix of 25%VG.
If you mixed at half it might be a little thick for some devices but if you found you liked 24mg, you could add a few drops of water or vodka to thin it down or buy some PG nicotine and mix them together.
If you went with 36mg, you're restricted to 18mg or lower, unless you buy triplers but not all sites sell triplers.
I suppose you could buy a smallish bottle of 36mg and a smallish bottle of 48mg, so you could play with different strengths.
Sorry, I'd love to add more detail and explain everything better but the misses is getting pissed at me, she wants me start dinner. Best to do what she says when she's hungry.

I'll edit this post later on tonight and make it easier to understand.
